vUtils

A collection of utils for golang

Implementations

1. Delta Of Binary Data
2. Encoding
3. Files Utilities
4. Lists
• Array List
  • How To Use
  • Optimization
5. Optional
6. Random
• Safe Randoms
  • String
  • Integer
• Unsafe Randoms
  • String
  • Integer

Delta Of Binary Data

//

Encoding

Sha256 Encoding

Bytes Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result []byte = encoding.Sha256EncodeBytes([]byte("Encoding This String to Bytes using sha256"))
	print(result)
}

String Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result string = encoding.Sha256EncodeString("Encoding This String to String using sha256")
	print(result)
}

---

Sha512 Encoding

Bytes Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result []byte = encoding.Sha512EncodeBytes([]byte("Encoding This String to Bytes using sha521"))
	print(result)
}

String Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result string = encoding.Sha512EncodeString("Encoding This String to String using sha512")
	print(result)
}

---

Base64 Encoding

Bytes Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result []byte = encoding.Base64EncodeBytes([]byte("Encoding This String to Bytes using Base64"))
	print(result)
}

String Encoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result string = encoding.Base64EncodeBytes("Encoding This String to String using Base64")
	print(result)
}

---

Base64 Decoding

Bytes Decoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result []byte = encoding.Base64DecodeBytes([]byte("RGVjb2RpbmcgVGhpcyBTdHJpbmcgdG8gQnl0ZXMgdXNpbmcgQmFzZTY0"))
	print(result)
}

String Decoding

import "github.com/iimrudy/vUtils/encoding"

func main() {
    var result string = encoding.Base64DecodeString("RGVjb2RpbmcgVGhpcyBTdHJpbmcgdG8gU3RyaW5nIHVzaW5nIEJhc2U2NA")
	print(result)
}

Files Utilities

//

Lists

ArrayList

Add an item to the arraylist

func (al *ArrayList) Add(item interface{}) {}

Get the index of an item

func (al *ArrayList) IndexOf(item interface{}) int {}

Get the size of the arraylist

func (al *ArrayList) Size() int {}

Check if a list contains an item

func (al *ArrayList) Contains(item interface{}) bool {}

Clear the list

func (al *ArrayList) Clear() {}

Get an item given the index (Can panic if index is out of bound)

func (al *ArrayList) Get(index int) interface{} {}

Iterate over the array given an Iterator Function

func (al *ArrayList) Iterate(fun func(item interface{}, index int)) {}

Panic if the given index is OutOfBound

func (al *ArrayList) RangeCheck(index int) {}

Set an item into the arrayList in the given index (Can panic if index is out of bound)

func (al *ArrayList) Set(index int, item interface{}) {}

Remove an item in the given index (Can panic if index is out of bound)

func (al *ArrayList) RemoveIndex(index int) (item interface{}) {}

Remove an item from the arraylist

func (al *ArrayList) Remove(item interface{}) {}

Example

import "github.com/iimrudy/vUtils/list"

func main() {
    // create a new arraylist
    var theList *list.ArrayList = list.NewArrayList()
    element1 := "An Item"
    element2 := "Another Item"
    // Add an item
    theList.Add(element1)
    theList.Add(element2)

    // Remove an item
    theList.Remove(element1)

    print(theList.Contains(element1))

    // Clear The List
    theList.Clear()
}

Optimizations

If you know how many items you can fit into the arrayList you can create it with an initial size.

import "github.com/iimrudy/vUtils/list"

func main() {
    // create a new arraylist
    var initialSize int = 100
    var theList *list.ArrayList = list.NewArrayListSize(initialSize)
    
    // do stuff with the arrayList
}

This improve a lot the timings when adding new elements.

Example: Adding 10.000.000 Items on the arrayList

• List created with list.NewArrayList() timings: 783071 microSeconds

• List created with list.NewArrayListSize(10000000) timings: 315598 microSeconds

You can see that creating the list with a known starting size is more efficient

Optional

As java documentation say 'A container object which may or may not contain a non-null value.'

Check if there is an item in the OptionalContainer

func (o *Optional) IsPresent() bool {}

Get the item in the OptionalContainer

func (o *Optional) Get() interface{} {}

Call the function if the item is presente into the OptionalContainer (Chainable)

func (o *Optional) IfIsPresent(f func(item interface{})) *Optional {}

Call the function if the item is NOT presente into the OptionalContainer (Chainable)

func (o *Optional) IfNotPresent(f func()) *Optional {}

import "github.com/iimrudy/vUtils/optional"

func main() {
    // create a new arraylist
    var optional1 *optional.Optional = optional.Of(nil) // this will panic, cannot provide null items
    var optional2 *optional.Optional = optional.OfNullable(nil) // this is fine, null-Able, can contain a null var.

    optional1.IfIsPresent(func(item interface{}) {
        print("The Item is present ", item)
	})

    optional1.IfNotPresent(func() {
        print("The Item is NOT present")
	})

    // Or you can chain the functions
    optional1.IfIsPresent(func(item interface{}) {
		print("The Item is present ", item)
	}).IfNotPresent(func() { // here is the chained function.
		print("The Item is NOT present")
	})
}

Random

Used chars for random strings (safe and unsage):

• 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-

Safe Randoms

Safe Random String

import "github.com/iimrudy/vUtils/random"

func main() {
    length := 10 // string length
    var result string = random.GenerateSafeString(length)
	print(result)
}

Safe Random Integer

import "github.com/iimrudy/vUtils/random"

func main() {
    var result1 int = random.RandomIntSafe(0, 100) // generate an int beetwen 0 and 100
	print(result1)

    var result2 int = random.RandomInt64Safe(0, 100) // generate an int64 number beetwen 0 and 100
	print(result2)
}

---

Unsafe Randoms

Unsafe Random String

import "github.com/iimrudy/vUtils/random"

func main() {
    length := 10 // string length
    var result string = random.GenerateString(length)
	print(result)
}

Unsafe Random Integer

import "github.com/iimrudy/vUtils/random"

func main() {
    var result1 int = random.RandomInt(0, 100) // generate an int beetwen 0 and 100
	print(result1)

    var result2 int = random.RandomInt64(0, 100) // generate an int64 number beetwen 0 and 100
	print(result2)
}